1 #include <linux/proc_fs.h>
2 #include <linux/nsproxy.h>
3 #include <linux/sched.h>
4 #include <linux/ptrace.h>
5 #include <linux/fs_struct.h>
6 #include <linux/mount.h>
7 #include <linux/path.h>
8 #include <linux/namei.h>
9 #include <linux/file.h>
10 #include <linux/utsname.h>
11 #include <net/net_namespace.h>
12 #include <linux/mnt_namespace.h>
13 #include <linux/ipc_namespace.h>
14 #include <linux/pid_namespace.h>
18 static const struct proc_ns_operations *ns_entries[] = {
21 static const struct file_operations ns_file_operations = {
25 static struct dentry *proc_ns_instantiate(struct inode *dir,
26 struct dentry *dentry, struct task_struct *task, const void *ptr)
28 const struct proc_ns_operations *ns_ops = ptr;
30 struct proc_inode *ei;
31 struct dentry *error = ERR_PTR(-ENOENT);
33 inode = proc_pid_make_inode(dir->i_sb, task);
38 inode->i_mode = S_IFREG|S_IRUSR;
39 inode->i_fop = &ns_file_operations;
41 ei->ns = ns_ops->get(task);
45 dentry->d_op = &pid_dentry_operations;
47 /* Close the race of the process dying before we return the dentry */
48 if (pid_revalidate(dentry, NULL))
57 static int proc_ns_fill_cache(struct file *filp, void *dirent,
58 filldir_t filldir, struct task_struct *task,
59 const struct proc_ns_operations *ops)
61 return proc_fill_cache(filp, dirent, filldir,
62 ops->name, strlen(ops->name),
63 proc_ns_instantiate, task, ops);
66 static int proc_ns_dir_readdir(struct file *filp, void *dirent,
70 struct dentry *dentry = filp->f_path.dentry;
71 struct inode *inode = dentry->d_inode;
72 struct task_struct *task = get_proc_task(inode);
73 const struct proc_ns_operations **entry, **last;
82 if (!ptrace_may_access(task, PTRACE_MODE_READ))
90 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
96 ino = parent_ino(dentry);
97 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
104 if (i >= ARRAY_SIZE(ns_entries)) {
108 entry = ns_entries + i;
109 last = &ns_entries[ARRAY_SIZE(ns_entries) - 1];
110 while (entry <= last) {
111 if (proc_ns_fill_cache(filp, dirent, filldir,
121 put_task_struct(task);
126 const struct file_operations proc_ns_dir_operations = {
127 .read = generic_read_dir,
128 .readdir = proc_ns_dir_readdir,
131 static struct dentry *proc_ns_dir_lookup(struct inode *dir,
132 struct dentry *dentry, struct nameidata *nd)
134 struct dentry *error;
135 struct task_struct *task = get_proc_task(dir);
136 const struct proc_ns_operations **entry, **last;
137 unsigned int len = dentry->d_name.len;
139 error = ERR_PTR(-ENOENT);
144 error = ERR_PTR(-EPERM);
145 if (!ptrace_may_access(task, PTRACE_MODE_READ))
148 last = &ns_entries[ARRAY_SIZE(ns_entries) - 1];
149 for (entry = ns_entries; entry <= last; entry++) {
150 if (strlen((*entry)->name) != len)
152 if (!memcmp(dentry->d_name.name, (*entry)->name, len))
158 error = proc_ns_instantiate(dir, dentry, task, *entry);
160 put_task_struct(task);
165 const struct inode_operations proc_ns_dir_inode_operations = {
166 .lookup = proc_ns_dir_lookup,
167 .getattr = pid_getattr,
168 .setattr = proc_setattr,
171 struct file *proc_ns_fget(int fd)
177 return ERR_PTR(-EBADF);
179 if (file->f_op != &ns_file_operations)
186 return ERR_PTR(-EINVAL);